gistfile1.txt

    public Inventory generateInventory(Player player) {

        Inventory inventory;

        if (size == 5) {
            inventory = Bukkit.createInventory(null, InventoryType.HOPPER, name + inventoryID.getId());
        }
        else {
            inventory = Bukkit.createInventory(null, size, name + inventoryID.getId());
        }

        ItemStack[] itemStacks = new ItemStack[size];

        elementMap.entrySet().forEach(entry -> {

            int i = entry.getKey().toSlot();

            if (entry.getValue() instanceof ToggleableElement) {
                ToggleableElement toggleableElement = (ToggleableElement) entry.getValue();

                toggleableElement.testPredicate(CorePlayer.get(player), inventory);
            }
            
            itemStacks[i] = entry.getValue().getRepresentation();
        });
        
        inventory.setContents(itemStacks);

        System.out.println(Arrays.toString(itemStacks));

        System.out.println(Arrays.toString(inventory.getContents()));

        return inventory;
    }
    
    [21:41:34 INFO]: [ItemStack{CARROT x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}, ItemStack{AIR x 1}]
    [21:41:34 INFO]: [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]